Bravo View Portable Bluetooth Vibration Speaker System Wireless Capabilities: Wirelessly Stream audio with Bluetooth enabled devices, Bluetooth V2.1 for strong connections and improved signal, Built-in microphone for hands-free speakerphone operation, Auto Pairing with On/Off Switch Audio: Mini-jack audio input for portable devices, 15-Watts Total System Power, Four 1.25" Aluminum Drivers + Subwoofer, Vibration Technology for deep powerful bass, 360-degree sound, Vibration Bass on/off Switch Power: Built-in Rechargeable Lithium-ion battery lasts up to 5 hours, Includes 100-240V AC Power Adaptor Specifications: Output power: 15W, Frequency Response: 40-20,000Hz, Wireless: A2DP, AVRCP, HSP, HFP, Effective Range: up to 33 feet (10M), Power: Lithium-ion Battery, Size (L x W x H) = 3" x 3" x 3.4" Package Contents: (1) Thunder BT Speaker System, (1) AC Power Adaptor 100-240V, (1) Mini-jack audio cable, (1) Owner's Manual